Very creative from my point of view, especially with the GUI system and the idea of crafting them as an addition to the normal survival mode. I love it!
Works fantasically, easy to use, fun to play with. Overall a great submission!
Very original and new, the only thing that makes this not get a 10 was that you can create (I believe they're .mdi files) music files and play them that way, but this is a next step up!